INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Mingxia Song,Bofeng Zhang,Ziwei Zhai,Sibao Liu,Li Wang,Guozhu Liu
Atomically dispersed metal catalysts can maximize the utilization of metals and provide unique chemical properties for catalytic reactions. However, the stabilities of high-loading metal clusters on solid supports are still under dispute, because small clusters are prone to agglomerate into larger particles at high temperature. Here, we prepared thermally stable highly dispersed Pt species immobilized by bridging Zn2+ sites and silanol groups (Si-OH) on self-pillared silicalite-1 zeolite nanosheets (SP-S-1). The rotationally overgrown zeolite sheet-like structure provided a high specific surface area and abundant Si-OH, which favored atomically dispersed active sites with ZnOx-Si nanoclusters. The as-prepared PtZn/SP-S-1 exhibited a high specific activity of 1.23 molC3H6·gcatal–1·h–1 at 580 °C with propylene selectivity up to 99%. Moreover, no obvious deactivation was observed after 90 h on stream under a weight hourly space velocity of 15 h–1. The self-pillared nanosheet-supported metal catalysts provide prospective guidance for high-temperature catalysis.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Qinghu Guo,Xiangyu Meng,Dongxu Li,Zhonghua Yao,Huajun Sun,Hua Hao,Hanxing Liu,Shujun Zhang
Electrostrictive materials play an important role in the development of high precision actuators, due to the advantages of high resolution, low power dissipation and fast response time. However, the practical application of electrostrictive materials has been hindered by their limited displacement output. To address this, we conducted a study where we doped Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) ceramics with Nd 2 O 3 , aiming to significantly improve the electrostrictive effect by enhancing local structural heterogeneities that disrupt the formation of long-range ordered ferroelectric domains. We obtained an optimized electrostrictive strain of 0.231 % with negligible hysteresis at an electric field of 50 kV/cm in 4 %Nd-doped PMN-PT ceramic, surpassing the performance of state-of-the-art lead-based electrostrictive ceramics. Of particular significance is that a high electrostrictive coefficients M 33 = 12.2 × 10 −16 m 2 /V 2 , together with a high mechanical work density of 0.035 J/cm 3 and a low power dissipation of 14 %, was achieved under a mechanical prestress of 50 MPa and an electric field of 10 kV/cm. Additionally, this material exhibits excellent fatigue resistance , with less than 3 % variation over 10 6 operation cycles. All these findings position 4 %Nd-doped PMN-PT ceramics as a promising candidate for high-performance electromechanical actuator applications.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yajing Zhang,Hui Wang,Zhaoyong Bian
Currently, using electrochemical precipitation techniques for phosphate removal and recovery in hydroxyapatite (HAP) or calcium phosphate (CaP) form is widely used, while the high energy consumption of electrochemical precipitation is a major obstacle to its application. In this study, a square wave pulsed electrochemical phosphate precipitation method was developed, which achieved phosphate pollution control and phosphate resource recovery and reuse at the same time. The square wave pulsed electrochemical phosphate recovery system was constructed and a Pt-rGO/CuF electrode was synthesized and evaluated. This result indicated that the Pt-rGO/CuF electrode had the highest electrocatalytic activity, the better electrical conductivity, and the smallest electron transport barrier. Under optimal operation conditions, the phosphate removal efficiency and specific energy consumption of Pt-rGO/CuF were 64.2% and 21.49 kWh kg −1 , respectively. The Pt-rGO/CuF electrode demonstrated the best electrochemical precipitation reaction performance. The Pt-rGO/CuF electrode was applied to multiple types of actual wastewater, and the results showed that it has better application prospects in both low (7.75 mg L −1 ) and high (66 mg L −1 ) phosphate concentration wastewater, the phosphate removal efficiency was 75.5% and 59.1%, respectively. Compared with traditional chemical precipitation , the electrochemical precipitation method saved $2.88 per kg P and $57.57 per kg P, respectively.
研究领域:
环境科学
·
电化学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Xianwen Zhang,Zheng Li,Taifeng Liu,Mingrun Li,Chaobin Zeng,Hiroaki Matsumoto,Hongxian Han
When a proton reduction cocatalyst is loaded on an n-type semiconductor for photocatalytic overall water splitting (POWS), the location of water oxidation sites is generally considered at the surface of the semiconductor due to upward band-bending of n-type semiconductor which may ease the transfer of the photogenerated holes to the surface. However, this is not the case for Pt/SrTiO 3 , a model semiconductor based photocatalyst for POWS. It was found that the photogenerated holes are more readily accumulated at the interface between Pt cocatalyst and SrTiO 3 photocatalyst as probed by photo-oxidative deposition of PbO 2 , indicating that the water oxidation sites are located at the interface between Pt and SrTiO 3 . Electron paramagnetic resonance and scanning transmission electron microscope studies suggest that the interfacial oxygen atoms between Pt and SrTiO 3 in Pt/SrTiO 3 after POWS are more readily lost to form oxygen vacancies upon vacuum heat treatment, regardless of Pt loading by photodeposition or impregnation methods, which may serve as additional support for the location of the active sites for water oxidation at the interface. Density functional theory calculations also suggest that the oxygen evolution reaction more readily occurs at the interfacial sites with the lowest overpotential. These experimental and theoretical studies reveal that the more active sites for water oxidation are located at the interface between Pt and SrTiO 3 , rather than on the surface of SrTiO 3 . Hence, the tailor design and control of the interfacial properties are extremely important for the achievement or improvement of the POWS on cocatalyst loaded semiconductor photocatalyst.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Jiali Zhou,Ge Li,Hongfei Li,Ziran Ma,Shuang Liu,Xiaolong Tang
Sintering is among the most challenging obstacles preventing the development of platinum catalysts that highly effective for hydrocarbon combustion at low temperatures. To overcome this obstacle, a Pt@TiO 2 catalyst with platinum nanoparticles encapsulated by TiO x overlayers was synthesized in this article, via melamine-mediated calcinations at 800 °C in air. Being physically constrained (“protected”) and electronically buffered (“Pt x + /Pt 0 ↔ Ti 3+ /Ti 4+ ”) by the thermally stable TiO x , this catalyst preserved a large amount of reactive metallic Pt 0 sites, which therefore exhibited obviously higher activity for C 3 H 8 and C 3 H 6 combustion in comparison with conventional supported Pt/TiO 2 catalysts. Moreover, steam and SO 2 in the reaction atmospheres caused reversible influences on the catalytic performance of this sample, indicating the high practical potential of such a recipe for the design of platinum catalysts with superior activity and durability for hydrocarbon combustion.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 17
·2968
·
IF 5.719
Siyu Long,Lingyu Zhang,Zhuoyue Liu,Huibin Jiao,Aiwen Lei,Wei Gong,Xianglin Pei
The hydrogenation products of aromatic molecules with reducible groups (such as C=C, NO2, C=O, etc.) are relatively critical intermediate compounds in fine chemicals, but how to accurately reduce only specific groups is still challenging. In this work, a bimetallic Pt-Ni/Chitin catalyst was prepared for the first time by using renewable biomass resource chitin as support. As the carrier, the chitin was constructed into porous nanofibrous microspheres through the sol-gel strategy, which was favorable for the adhesion of nano-metals and the exchange of reactive substances due to its large surface area, porous structure, and rich functional groups. Then the Pt-Ni/Chitin catalyst was applied to selective hydrogenation with the model substrate of 4-nitrostyrene. As the highly dispersed Pt-Ni NPs with abundant exposed active sites and the synergistic effect of bimetals, the Pt-Ni/Chitin catalyst could efficiently and selectively hydrogenate only NO2or C=C with yields of ~99% and TOF of 660 h−1, as well as good stability. This utilization of biomass resources to build catalyst materials would be important for the green and sustainable chemistry.Keywords:biomass chitin;Pt-Ni nanoparticles;supported catalyst;hydrogenation
研究领域:
催化
·
绿色化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Advanced Dielectrics
·
2023
·
IF 3.1
Chaofeng Wu,Wen Gong,Jinfeng Geng,Jianye Cui,Lipeng Mi,Jingkai Nie,Qiang He,Jiajiu Li,Fang-Zhou Yao
Mn O 2 -modified Pb 0 . 9 6 2 5 Sm 0 . 0 2 5 ( Mg 1 / 3 Nb 2 / 3 ) 0 . 7 1 Ti 0 . 2 9 O 3 ceramics were prepared via a solid-state reaction approach. Results of detailed characterizations revealed that the addition of Mn O 2 has influence on the grain size, and all samples exhibit a pure perovskite structure. As the content of manganese increases, the volume of tetragonal phase increases. The ceramics with 1.5 mol.% Mn O 2 show a high electro-strain of 0.151% at 2 kV/mm. Therefore, this study provides a new insight into the role of Mn O 2 addition in tailoring the electrical properties of the Sm-PMN-PT ceramics by acceptor doping.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yunshi Liu,Xing Gao,Feng Li,Geyu Lu,Tong Zhang,Nicolae Barsan
Pt-loaded In 2 O 3 mesoporous nanofibers (NFs) have been prepared by electrospinning, followed by a facile reduction method. The sample obtained by adding tea saponin into the spinning solution, sample In-TS, displays a more than 4 times higher specific surface area, value of 86.9 m 2 g −1 , than that of conventionally prepared samples. The loading with small-sized Pt nanoparticles (NPs) determines excellent gas sensing performance towards NO 2 down to ppb level (R g /R a = 2.8 to 10 ppb and 23.9–1 ppm) at room temperature (RT), by that significantly lowering the power consumption. The reason is that the open pores and channels on the mesoporous NFs generated by the foaming agent not only promote the adsorption and desorption of NO 2 molecules on the sensing layers, but also improves the transduction function of the sensors by ensuring that there are no parts of the fiber that are not accessible to the gases. The introduction of Pt to the mesoporous NFs could accelerate the dissociation of absorbed oxygen and the active surface reactions in NO 2 owing to the catalytic property and chemical sensitization of well-dispersed Pt NPs. Due to the unique gas sensing performance, sample In-TS-Pt has a prospect for applications in low-concentration NO 2 detection at RT.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15662-15670
·
IF 2.8
Li Ji,Wang Yanhong,Tian Yiyuan,He Xuan,Yang Pingping,Yuan Minghui,Cao Yuqing,Lyu Jinze
The photocatalytic mineralization efficiency of volatile organic compounds (VOCs) is determined by adsorption of reactants, separation of charge carriers, and reaction activity of catalyst surface. Herein, we provide a strategy to synthesize a novel catalyst, namely, PhPt-Micro, which is characterized by high adsorption ability, charge separation efficiency, and surface reaction activity. Toluene was chosen as the model VOC. The effects of photochemical deposition of Pt on the physical properties of microporous amorphous TiO 2 (Micro) and toluene mineralization were studied using N 2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) analyses. After photochemical treatment, the structure of Micro was optimized, and Pt nanoparticles were successfully deposited at the outlet of electrons on the catalyst surface. SPS result proved that the optimized structure enhanced the separation efficiency of charge carriers and the migration of photo-generated electrons to the PhPt-Micro surface. The quasi-equilibrium adsorption amount of toluene over PhPt-Micro was two times higher than that with commercial nano TiO 2 (P25). The micropores concentrated toluene on the catalyst surface and hindered intermediate desorption. The mineralization efficiency of toluene over PhPt-Micro was 2.4 and 5.9 times higher than those over Micro and P25, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·413
·
IF 4
Nan Jiang,Xiaopo Niu,Danni Liu,Kaige Zhang,Zhen Guo,Yue Qin,Wenli Zhao,Xiangwen Zhang,Qingfa Wang
Designing bifunctional catalysts for efficient hydroisomerization of phenanthrene to alkyl-adamantane is a great challenge for producing high-density fuels. Herein, a bifunctional Pt catalyst was fabricated by developing hierarchical H-MSY-T zeolites with an NOA-co strategy. The influence of different mesopore template agents on the hierarchical structure of H-MSY-T zeolite was investigated. Effective regulation of pore structure and acid distribution of zeolites was achieved by adjusting the templating agents. The block copolymer P123 promoted the formation of mesoporous structures via self-assembly with a large mesopore centered at 8 nm. Large mesoporous structure and suitable distribution of Bronsted acid boosted the hydroisomerization of phenanthrene. The highest alkyl-adamantane yield of 45.9 wt% was achieved on the Pt/MSY-P1 catalyst and a reaction network of hydroisomerization was proposed. This work provides guidance to design highly selective bifunctional catalysts for the one-step hydroconversion of tricyclic aromatic hydrocarbons into high-density fuels.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Wen Chen,Zhiwei Huang,Jiangwei Ni,Qiqi Zhou,Xiaomin Wu,Huazhen Shen,Huawang Zhao,Guohua Jing
Volatile organic compounds such as benzene are hazardous air pollutants that require effective elimination. Noble metal-based catalysts exhibit high benzene combustion activity, but their prohibitive cost necessitates strategies to enhance utilization efficiency. This study investigates a Pt–Cu alloy catalyst for improved benzene combustion by preferentially exposing Pt active sites through Cu alloying. Aberration-corrected scanning transmission electron microscopy and X-ray spectroscopy characterize the nanoscale distribution and enrichment of Pt on the alloy surface. Kinetic measurements demonstrate substantially enhanced activity compared with Pt catalysts, attributed to increased Pt metallic site exposure rather than alteration of the reaction mechanism. In situ Fourier transform infrared (FTIR) spectroscopy reveals a higher abundance of terrace-like Pt sites in the alloy, beneficial for benzene adsorption. Partial pressure dependence analyses indicate competitive adsorption of benzene and O2, following Langmuir–Hinshelwood kinetics. These findings provide conceptual insights into tuning surface composition in bimetallic catalysts to optimize noble metal efficiency, with broad applicability for sustainable catalytic process advancement.
研究领域:
催化
·
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2016
·Vol. 2017
·期 1
·172-178
·
IF 2.686
Gui-lin Zhuang,Jia-qi Bai,Xiang Zhou,Yi-fen Gao,Hong-liang Huang,Hai-quan Cui,Xing Zhong,Chong-Li Zhong,Jian-guo Wang
Graphical The effects of metal–organic framework (MOF) supports on catalytic activity were uncovered for highly dispersed Pt nanoparticles (NPs) loaded in UiO-67. Investigations of the effects of the support on catalytic properties are important for heterogeneous systems. Herein, we report the preparation of highly dispersed Pt nanoparticles (NPs) in three isomorphous UiO-67-type metal–organic frameworks (MOFs), namely, pristine UiO-67, N-UiO-67, and NH 2 -UiO-67. Structural measurements revealed that the sizes of the Pt NPs were 4.5 nm for Pt/UiO-67 and 2.5 nm for N-UiO-67 and NH 2 -UiO-67. The dominant influences on the sizes of the Pt NPs are the functional groups of the support and the pore size of the MOF. Furthermore, CO catalytic oxidations were performed as a model reaction. Interestingly, the catalytic performance sequence is 5 % Pt/N-UiO-67 > 5 % Pt/UiO-67 > 5 % Pt/NH 2 -UiO-67. A combination of experimental measurement and DFT calculation revealed that the catalytic properties depend on not only the size of the Pt NPs but also the nature of the support.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）